ATtiny44 datasheet(65/236 Pages) ATMEL

65 / 236 page

8006H–AVR–10/09

ATtiny24/44/84

10.2.2

Alternate Functions of Port B

The Port B pins with alternate function are shown in Table 10-7.

• Port B, Bit 0 – XTAL1/PCINT8

• XTAL1: Chip Clock Oscillator pin 1. Used for all chip clock sources except internal

calibrateble RC oscillator. When used as a clock pin, the pin can not be used as an I/O pin.

When using internal calibratable RC Oscillator as a chip clock source, PB0 serves as an

ordinary I/O pin.

•PCINT8: Pin Change Interrupt source 8. The PB0 pin can serve as an external interrupt

source for pin change interrupt 1.

• CLKI: Clock Input from an external clock source, see “External Clock” on page 26.

• Port B, Bit 1 – XTAL2/PCINT9

• XTAL2: Chip Clock Oscillator pin 2. Used as clock pin for all chip clock sources except

internal calibrateble RC Oscillator and external clock. When used as a clock pin, the pin can

not be used as an I/O pin. When using internal calibratable RC Oscillator or External clock as

a Chip clock sources, PB1 serves as an ordinary I/O pin.

•PCINT9: Pin Change Interrupt source 9. The PB1 pin can serve as an external interrupt

source for pin change interrupt 1.

• Port B, Bit 2 – INT0/OC0A/CKOUT/PCINT10

•INT0: External Interrupt Request 0.

• OC0A: Output Compare Match output: The PB2 pin can serve as an external output for the

Timer/Counter0 Compare Match A. The PB2 pin has to be configured as an output (DDB2

set (one)) to serve this function. The OC0A pin is also the output pin for the PWM mode timer

function.

• CKOUT - System Clock Output: The system clock can be output on the PB2 pin. The system

clock will be output if the CKOUT Fuse is programmed, regardless of the PORTB2 and DDB2

settings. It will also be output during reset.

•PCINT10: Pin Change Interrupt source 10. The PB2 pin can serve as an external interrupt

source for pin change interrupt 1.

Table 10-7.

Port B Pins Alternate Functions

Port Pin

Alternate Function

PB0

XTAL1: Crystal Oscillator Input

PCINT8: Pin Change Interrupt 1, Source 8

CLKI:

External Clock Input

PB1

XTAL2: Crystal Oscillator Output

PCINT9: Pin Change Interrupt 1, Source 9

PB2

INT0:

External Interrupt 0 Input

OC0A:

Timer/Counter0 Compare Match A output

CKOUT: System Clock Output

PCINT10:Pin Change Interrupt 1, Source 10

PB3

RESET: Reset pin

dW:debugWire I/O

PCINT11:Pin Change Interrupt 1, Source 11.

ATtiny44 Datasheet(PDF) 65 Page - ATMEL Corporation

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